Teeth to tail: 6 stories about sharks this week

Editor’s note: Shark Week 2017 kicks off in a couple of days, featuring everything from an Olympian racing a great white to our very own scientist’s exploration of “alien” species. Before you dive in, take a look at six of Human Nature’s most popular shark stories — and scroll down to the end to see our Shark Week Photo Gallery.

Walking sharks are only active at night, when they emerge from hiding places to “walk” about the reef in search of food. Here, a pioneer in the study of walking sharks describes key findings about the species.